Chromium (hexavalent)
Cal-water Service Company - Chico
Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | 1.70 ppb | 27 | 27 | 0.510 ppb - 7.30 ppb |
2014 | 1.99 ppb | 104 | 86 | ND - 7.20 ppb |
2015 | 3.39 ppb | 2 | 2 | 0.570 ppb - 6.20 ppb |
2016 | N/A | 0 | 0 | N/A |
2017 | 3.00 ppb | 1 | 1 | 3.00 ppb |
2018 | 3.20 ppb | 1 | 1 | 3.20 ppb |
2019 | 3.40 ppb | 1 | 1 | 3.40 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.02 ppb
The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2013-07-08 | 201307090264AM | 4.40 ppb |
2013-07-09 | 201307100959AM | 1.30 ppb |
2013-07-10 | 201307110728AM | 1.40 ppb |
2013-07-10 | 201307110719AM | 0.710 ppb |
2013-07-23 | 201307240450AM | 7.30 ppb |
2013-07-24 | 201307250294AM | 3.20 ppb |
2013-08-05 | 201308060205AM | 0.670 ppb |
2013-08-05 | 201308060170AM | 1.30 ppb |
2013-08-07 | 201308080252AM | 0.930 ppb |
2013-08-07 | 201308080293AM | 1.10 ppb |
2013-08-14 | 201308150415AM | 1.60 ppb |
2013-08-14 | 201308150372AM | 0.650 ppb |
2013-08-14 | 201308150515AM | 0.560 ppb |
2013-08-20 | 201308210541AM | 1.000 ppb |
2013-08-20 | 201308210527AM | 0.510 ppb |
2013-08-21 | 201308220196AM | 1.50 ppb |
2013-08-21 | 201308220224AM | 0.900 ppb |
2013-08-27 | 201308290349AM | 5.10 ppb |
2013-09-17 | 201309180766AM | 4.00 ppb |
2013-09-17 | 201309180756AM | 0.900 ppb |
2013-09-17 | 201309180523AM | 1.000 ppb |
2013-09-18 | 201309200062AM | 1.60 ppb |
2013-10-08 | 201310090471AM | 0.820 ppb |
2013-10-08 | 201310090668AM | 0.830 ppb |
2013-10-08 | 201310090480AM | 1.20 ppb |
2013-10-15 | 201310160272AM | 0.680 ppb |
2013-10-15 | 201310160230AM | 0.770 ppb |
2014-01-07 | 201401080517AM | 5.90 ppb |
2014-01-07 | 201401080498AM | 3.10 ppb |
2014-01-08 | 201401090451AM | 4.10 ppb |
2014-01-14 | 201401150436AM | 6.20 ppb |
2014-01-14 | 201401150419AM | 7.20 ppb |
2014-01-21 | 201401220306AM | 1.30 ppb |
2014-01-22 | 201401230434AM | 0.830 ppb |
2014-01-22 | 201401230386AM | 0.800 ppb |
2014-01-28 | 201401290599AM | 0.650 ppb |
2014-02-11 | 201402120761AM | 0.940 ppb |
2014-02-11 | 201402120779AM | 0.670 ppb |
2014-02-11 | 201402120801AM | 0.890 ppb |
2014-02-11 | 201402120796AM | 0.860 ppb |
2014-02-11 | 201402120770AM | 1.10 ppb |
2014-02-12 | 201402130427AM | 1.50 ppb |
2014-02-12 | 201402130418AM | 1.20 ppb |
2014-02-12 | 201402130408AM | 0.540 ppb |
2014-02-19 | 201402200379AM | 0.730 ppb |
2014-02-26 | 201402270249AM | 1.50 ppb |
2014-02-26 | 201402270198AM | 0.500 ppb |
2014-02-28 | 201403010100AM | 2.50 ppb |
2014-03-04 | 201403050607AM | 1.40 ppb |
2014-03-04 | 201403050444AM | 1.20 ppb |
2014-03-04 | 201403050465AM | 0.540 ppb |
2014-03-04 | 201403050733AM | 0.810 ppb |
2014-03-05 | 201403060274AM | 4.40 ppb |
2014-03-17 | 201403180363AM | 6.90 ppb |
2014-03-17 | 201403180220AM | 5.00 ppb |
2014-03-17 | 201403180312AM | 5.70 ppb |
2014-03-18 | 201403190838AM | 4.70 ppb |
2014-03-18 | 201403190853AM | 6.00 ppb |
2014-04-08 | 201404090696AM | 0.820 ppb |
2014-04-08 | 201404090706AM | 1.10 ppb |
2014-04-08 | 201404090549AM | 0.390 ppb |
2014-04-09 | 201404100812AM | 1.10 ppb |
2014-04-09 | 201404100739AM | 4.90 ppb |
2014-04-09 | 201404100713AM | 0.720 ppb |
2014-04-09 | 201404100767AM | 0.890 ppb |
2014-04-09 | 201404100695AM | 1.10 ppb |
2014-04-22 | 201404230621AM | 4.00 ppb |
2014-04-22 | 201404230456AM | 1.20 ppb |
2014-04-23 | 201404240401AM | 3.50 ppb |
2014-04-23 | 201404240508AM | 1.20 ppb |
2014-06-18 | 201406190415AM | 3.00 ppb |
2014-07-09 | 201407100534AM | 0.780 ppb |
2014-07-09 | 201407100481AM | 0.750 ppb |
2014-07-14 | 201407150441AM | 0.560 ppb |
2014-08-05 | 9590-006-1130 | ND |
2014-08-05 | 9590-007-0907 | 3.00 ppb |
2014-08-05 | 9590-011-0948 | 2.30 ppb |
2014-08-05 | 9590-013-0923 | 4.60 ppb |
2014-08-06 | 9590-010-0932 | 2.40 ppb |
2014-08-06 | 9590-017-0812 | 4.50 ppb |
2014-08-13 | 9590-018-0806 | ND |
2014-08-13 | 9590-019-0745 | 4.20 ppb |
2014-08-13 | 9590-020-1320 | ND |
2014-08-13 | 9590-023-0942 | 1.50 ppb |
2014-08-13 | 9590-026-1305 | ND |
2014-08-13 | 9590-036-0850 | 3.90 ppb |
2014-08-18 | 9590-027-1012 | 4.50 ppb |
2014-08-18 | 9590-035-1340 | ND |
2014-08-20 | 9590-030-0845 | 2.20 ppb |
2014-08-20 | 9590-031-1017 | 1.80 ppb |
2014-08-20 | 9590-032-1005 | ND |
2014-08-20 | 9590-034-0930 | 1.10 ppb |
2014-08-25 | 9590-038-0845 | ND |
2014-08-26 | 9590-028-0958 | ND |
2014-08-26 | 9590-029-1042 | 2.50 ppb |
2014-08-26 | 9590-033-1055 | ND |
2014-08-26 | 9590-037-0810 | ND |
2014-09-03 | 1610-041-0850 | 5.70 ppb |
2014-09-03 | 1610-043-0845 | 1.10 ppb |
2014-09-03 | 1610-048-1040 | 4.40 ppb |
2014-09-03 | 1610-049-1130 | ND |
2014-09-03 | 1610-050-0905 | ND |
2014-09-08 | 1610-053-0950 | 1.20 ppb |
2014-09-08 | 1610-061-0905 | 1.10 ppb |
2014-09-08 | 1610-065-0915 | 1.20 ppb |
2014-09-09 | 1610-059-0835 | 6.90 ppb |
2014-09-09 | 1610-062-0840 | 1.20 ppb |
2014-09-10 | 201409110682AM | 2.80 ppb |
2014-09-10 | 201409110780AM | 6.00 ppb |
2014-09-15 | 1610-069-0935 | ND |
2014-09-15 | 1610-075-1200 | ND |
2014-09-15 | 1610-076-0900 | 1.50 ppb |
2014-09-15 | 1610-136-0910 | ND |
2014-09-15 | 1610-140-1000 | 1.30 ppb |
2014-09-17 | 1610-077-0825 | 1.40 ppb |
2014-09-17 | 1610-134-0754 | 1.70 ppb |
2014-09-23 | 201409240603AM | 0.630 ppb |
2014-09-24 | 201409250610AM | 1.40 ppb |
2014-10-07 | 201410080529AM | 0.450 ppb |
2014-10-07 | 201410080454AM | 4.60 ppb |
2014-10-07 | 201410080399AM | 1.10 ppb |
2014-10-07 | 201410080396AM | 1.20 ppb |
2014-10-08 | 201410090319AM | 1.20 ppb |
2014-10-15 | 201410160407AM | ND |
2014-10-27 | 201410290066AM | 3.40 ppb |
2014-12-09 | 201412100750AM | 2.70 ppb |
2014-12-10 | 1610-005-0950 | 1.60 ppb |
2014-12-10 | 1610-074-1024 | 3.70 ppb |
2014-12-18 | 1610-054-0735 | ND |
2014-12-18 | 1610-057-0600 | 3.30 ppb |
2014-12-18 | 1610-064-0755 | ND |
2015-01-13 | 201501140883AM | 0.570 ppb |
2015-07-14 | 5810-052-0700 | 6.20 ppb |
2017-06-06 | 1610-041-0945 | 3.00 ppb |
2018-06-05 | 5810-041-1041 | 3.20 ppb |
2019-06-06 | 1610-041-0805 | 3.40 ppb |